Grinding machine



A. P. STEINER GRINDING MACHINE Dec.- 5, 1933.

Filed Dec. 22, 1928 5 Sheets-Sheet -1 I Hi i INVENTOR.

" (WAS STEWEQ A roRivEys.

A. P. STEINER GRINDING MACHINE Dec. 5, 1933.

Filed Dec. 22, 1928 3 Sheets-Sheet 2 A T RNEYS.

Dec. 5, 1933. A, R EIN 1,937,726

GRINDING MACHINE Filed Dec. 22, 1928 5 Sheets-Sheet 3 IN VEN TOR.

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A ORNEYS.

Patented Dec. 5, 1933 1,937,726 GRINDING MACHINE Amos P. Steiner,Waynesbcro, Pa., assignor to Landis Tool Company, Waynesbcro, Pa., acorporation of Pennsylvania Application December 22, 1923.

Serial No. 327,903

10 Claims. (01. 51 -195) This invention relates'to grinding machines,and particularly to machines for grinding a face and hub of a gear atthe same time. Although not limited to such use, it is particularlydesigned for use in grinding the hub and face of a bevel gear. 1 i

An object of the invention is to provide a machine in which the face andhub of a gear may be ground at the same time and with a single abrasivewheel.

A further object is to provide a machine for performing work of thischaracter in which the whole cycle of operations may be controlled by asingle control mechanism.

A still further object is to provide a wheel dressing means for agrinding wheel of the character required for grinding both the face andhub of a gear which may be moved to dress a wheel without traversing thework carriage.

Further objects and advantages will become apparent as the descriptionproceeds.

Referring to the accompanying drawings, which are made a part hereof andon which similar reference characters indicate similar parts,

Figure 1 is a front elevation of my machine,

Figure 2 is a partial end view showing means for operating the grindingwheel feed mechanism,

Figure 3 is a sectional elevation of'the foot stock control valve, 1 a

Figure 4 is a plan view of the work supporting and rotating mechanismpartly in section,

Figure 5 is an enlarged view of portions of the head stock and footstock showing them in grinding position,

a Figure 6 is a section through the operating mechanism for the wheeltruing fixture, 1 V

Figure "7, a plan view of the wheel truing firture,

Figure 8, a detail view showing-the grinding wheel in position to grindthe hub and face of a.

gear, and i Figure 9, an end elevation of the truing fixture. i i

In the drawings Fig. 1, numeral 10, indicates the bed of a grindingmachine having a work carriage 11 slidably mounted in guideways thereon.Each end of the bed is provided with brackets62 and 63 in which arethreaded adjustable stop screws 62' and 63. On one end of the workcarriage 11 is a depending bracket 47 carrying an adjustable screw48adapted to strike against an indicator 49 mounted ina bracket 50 on thebed of the machine. The indicator, is graduated so that the slightestmovement of the carriage 11 after the screw 48 engages with it, willindi-- cate the position of the carriage.

In order to secure accurate work the work carriage must be positionedaccurately in relation to the grinding wheel. In order to accomplishthis, the stop screw 63 is adjustable to position the work carriage 11in exact position before the grinding wheel. The screw 48 is adjusted toposition the indicator 49 at the zero mark when the work carriage ispositioned correctly before the grinding wheel. The adjusting screw 63determines the position of the work carriage for accuracy but theindicator is an ad-- ditional means for indicating when the workcarriage is in correct position; Mounted on the Work carriage 11 arehead stock and tail-stock 13 and 14. The head stock 13 has mountedthereon a spindle 103 which spindle is rotatably mounted in bearings 104and 105 on the head stock. The head stock spindle 103 may be driven bymeans of a'motor 15 driving through a pinion 16, a chain 65 and a pinion17. The spindle 103 i has mounted thereon .a suitable chuck Support 107to which is secured a chuck 30'.-The chuck may be secured to the supportin any suitable way as by screws 31. For the particular work for whichthe machine is designed this chuck has balls 137 which fit betweentheteeth of the bevel gear on the work'133 in order to hold the work torotate with the spindle. The tail stock 14 is mounted to slide on aslide base 134 mounted on the work carriage 11. As shown, the slide baseis made integral-with the head stock 13 but need not nec essarily be soconstructed. The tail stock l lhas a curved portion 135 which carries aspindle 101 rotatably mounted in ball bearings therein. The spindle hasa splined end upon which the gear is placed and keyed against rotationon the spindle. A bracket 102 is mounted on the slide basel34. Thisbracket carries a removable ring' 138 which fits around the spindle 101.As the tail stock is withdrawn the work strikesagainst the bracket andis thereby removed from the spindle. The foot stock 14 is moved into andout of grinding position by means of a fluid motor which consists of acylinder 139 having a piston 97 reciprocably mounted therein. A pistonrod 96 is secured at 98: to the foot stock 14.

The cylinder 139 is provided with fluid inlet and outlet ports 99 and100 to which fluid conduits l9 and 18 are attached.

Since the machine is designed to grind two surfaces on the work, whichsurfaces are in different planes, it is necessary to position the chuckwith its axis oblique with respect to the direction of travel or" thework carriage.

Motive fluid to and from the cylinder 139 is controlled by means of avalve 20 shown in detail in Fig. 3. This consists of a valve casinghaving inlet port 21 for pressure fluid from the fluid line 21 incommunication with the discharge line 24 of a pump 53. The valve chamberhas an exhaust port 69. Ports 18' and 19 are connected to fluid conduits18 and 19 for delivering and exhausting fluid to and from cylinder 139.A valve stem 20 is connected by means of a chain 28 to an arm 29 on ashaft 30. Secured to the shaft 30 is a foot pedal 31 by means of whichthe arm 29 is rocked to operate valve stem 20 in one direction. A spring160 surrounding the stem 20' acting against a piston on the stem returnsthe valve stem in the other direction to move the stem to deliver fluidto the cylinder 139 so as to move the tail stock to working position.The shaft 30 is secured in bearings in brackets 64 secured to the bed ofthe grinding machine.

As shown in Figs. 4 and 5 an abrasive wheel 91 has its periphery cut toprovide grinding surfaces 163 and 164 at substantially right angles toeach other, which will grind the hub and rear face of the gear 133 sothat these surfaces will be at substantially right angles to each other.The angle of the grinding surfaces on the periphery of the grindingwheel obviously could be other .than right angles, so as, to grind theface of the gear to provide any desired angle between such face and thehub of the gear.

The grinding wheel 91 is mounted upon a base 12 which base is moved intoand out of grinding position by means of a fluid motor similar to theone which operates the tail stock. It consists ofa piston operating in acylinder 27. The piston has a piston rod secured to the depending arnr168 on the wheel base. The cylinder has fluid ports at'opposite sides ofthe piston. The admission and discharge of motive fluid to the cylinder27 is controlled by a valve similar in all respects to that shown inFig. 3.

The valve which controls the motor which operates the wheel base feed 12is operated by means of the foot pedal 31 and the following connections:The shaft 30 has on its outer end a rock arm- 32 to which is attached alink 35. The link 35 moves in a guide bracket 33 on the end of the baseof the machine. A collar 34 secured on the link 35 has a spring 34positioned between it and the bracket 33. The purpose of this spring isto move the foot pedal 31 to elevated position, as shown in Fig. 2. Thelink 35 is connected to one arm of a bell crank lever '73 to the otherarm of which is connected another link 37. This latter link is connectedto one arm of a bell crank 38 to the other arm of which is attachedanother link 39 This latter link is connected to an arm 40 on a shaft 40which passes into the base of the machine. To the other end of thisshaft 40 is attached a short arm to which is attached a link 42. Thislink is connected at its other end to another short arm on a shaft 41.This shaft, in turn, has another long arm 52 secured on its other end.The upper end of this long arm 52 is secured to a valve stem 43 similarin all respects to the valve stem 20 shown in Fig. 3 which valve stemoperates the valve 20. The valve stem operated by the arm 52 controlsadmission of fluid to the motor which moves the wheel base into and outof grinding position. The use of the system of links and levers justdescribed is made necessary with some machines such as this since it isinconvenient to place the valve stem in an easily accessible position.Where possible the valve stem may be operated directly by the link 39.

A short shaft 44 is fixed to the rear of the base 10 of the machine andhas secured thereon a wedge-shaped block 45. The rear of the wheel basehas a limit switch 46 secured thereon, which switch is operated by aroller 46. The cam surface on the block 45 strikes the roller 46 as the.wheel base 12 is moved into grinding position. The limit switch 46controls operation of the motor 15 which drives the work.

The object of the structure just defined is to start rotation of thework as soon as the grinding wheel is brought to grinding position.

At 58 and 59 is shown a wheel dressing device which may be secured tothe bed of the machine by a screw which is operated by a hand lever 199.The wheel dressing device forms no part of the present invention andtherefore will not be described further in detail.

The work carriage 11 may be manually operated by means of a hand wheel57, pinions 56, 55 and a rack 54 secured to the under side of thecarriage.

It will be obvious tothose skilled in the art that various changes maybe made in my device without departing from the spirit of the invention,and I therefore, do not limit myself to what is, shown in the drawingsand described in the specification, but only as set forth in theappended claims.

Having thus fully described my said invention, what I claim as new anddesire to secure by Letters Patent, is:

1. A grinding machine for grinding the hub and a face of a gearcomprising a base, a grinding wheel carriage on said base and movableinto and out of grinding position, a grinding wheel on said carriage, afluid motor for moving said grinding wheel carriage into and out ofgrinding position, a work carriage, a head stock rotatably mounted uponsaid work carriage, a tail stock base mounted upon said work carriage, atail stock slidably mounted in said tail stock base, a motor for movingsaid tail stock into work engaging position and a common control forboth of said fluid motors, substantially as set forth.

2. A machine for grinding the hub and adjacent face of a gear comprisingmeans for supporting thegear in an angular position before a grindingwheel, hydraulic means for moving a grinding wheel into and out ofgrinding position, hydraulic means for moving the work supporting meansinto and out of operative position, the said means for moving thegrinding wheel out of grinding position operating slightly in advance ofthe means for moving the work supporting means out of grinding positionand a common control for the last two named means, substantially as setforth.

3. A grinding machine comprising a base, a work support, a Wheelsupport, means for moving the wheel support toward the work support, thework support having mounted thereon a head stock and a tail stock, andmanually controlled fluid means for moving the work support to grindingposition and for moving the tail stock into operative position, andmeans for accurately locating it in such'position, and an auxiliarymeans including a stop and a gauge for determining when the carriage, isin accurate Working position, substantially as set forth.

4. A grinding wheel comprising a base, a work carriage slidably mountedon said base, a grinding weel base slidably mounted on said grindingmachine base, work supporting means carried by said work carriage, thesaid work supporting means comprising a head stock and a tail stock,means for rotating the head stock, means for moving the tail stock intoand out of work engaging position, means for removing the work from thetail stock as the latter is moved out of working position, means formoving the grinding wheel base into and out of grinding position, andmeans on the grinding wheel base for starting the work rotating motorwhen the grinding wheel is in grinding position and for causingcessation of operation of the work rotating motor when the grindingwheel base is in inoperative position, substantially as set forth.

5. Means for grinding two surfaces on different planes at the same timewith a single grindoblique with respect to the axis of rotation of thegrinding wheel, the grinding 'wheel having its peripheral grindingsurface cut on two planes substantially at right angles to each otherfor grinding the hub and the face of the gear simultaneously, a bracketmounted on the base, a work. spindle mounted on the work support andextending through the said bracket, the said bracket serving to removethe work from the spindle as the work support is withdrawn, and meansfor moving the work and the grinding wheel into and out of grindingposition, substantially as set forth.

'7. A grinding machine for grinding the hub and adjacent face of a gearcomprising a grinding wheel base, a grinding wheel mounted thereon,means for supporting the gear so that the plane of the gear will lie atan oblique angle with respectto the plane of the grinding wheel, meansfor rotating the gear while beingground, hydraulic means for moving thegrinding wheel into and out of grinding position, hydraulic means formoving the work supporting means into and out of grinding position,control means for the said hydraulic means so arranged that in movinginto grinding position the work is first brought to position and thenthe grinding wheel is moved up and in moving out of grinding position,the wheel is first moved and then the work is withdrawn, substantiallyas set forth.

8; In a grinding machine for grinding the hub and adjacent face of agrear, a work support, means for securing the work thereon, means forrotating the work support, means for moving the work securing means tobring the work piece into grinding position, and means for centering thework support and the work itself, and means for driving the work by thework centering means, substantially as set forth.

9. In a machine for grinding the hub and adjacent face of a gearcomprising the combination with a grinding wheel, of a work supporthaving its axis oblique with respect to the plane of the wheel, 'meansfor rotating the work support, means for centering the work, said meansserving also to support the work, and a work removing device positionedto remove the work as it is withdrawn from grinding position,substantially as set forth.

10. In a machine for grinding the hub and an adjacent face of a gear, awork support comprising a head stock and a recess therein adapted toreceive a Work holder, a tail stock, a work centering and supportingshaft carried by the tail stock, said shaft having a fluted end toreceive the gear and to hold it against rotating thereon, and meansengageable with a face of the gear as the holding means is Withdrawn forremoving the work from its support, substantially as set forth.

AMOS P. STEINER.

